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Zhang L, Li N, Chen Z, Li X, Fan A, Shao H. Investigating the substitution of intermolecular hydrogen bonds on the surface of self-assembled monolayer by scanning electrochemical microscopy. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116790] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Hájková-Strejcová A, Augustín M, Barek J, Iffelsberger C, Matysik FM, Vyskočil V. New strategy in electrochemical investigation of DNA damage demonstrated on genotoxic derivatives of fluorene. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116430] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Fan A, Chen J, Li N, Guo H, Li X, Zhang L, Shao H. Probing Ca2+-induced electron transfer on the surface of self-assembled monolayer using SECM. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Li N, Chen J, Huang X, Guo H, Li X, Fan A, Shao H. Competition of ion-pair during the transition from hydrogen bonding to electrostatic interaction on self-assembled monolayer. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.139310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Iffelsberger C, Wert S, Matysik FM, Pumera M. Catalyst Formation and In Operando Monitoring of the Electrocatalytic Activity in Flow Reactors. ACS APPLIED MATERIALS & INTERFACES 2021; 13:35777-35784. [PMID: 34283572 DOI: 10.1021/acsami.1c09127] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Flow reactors are of increasing importance and have become crucial devices due to their wide application in chemical synthesis, electrochemical hydrogen evolution reaction (HER), or electrochemical waste water treatment. In many of these applications, catalyst materials such as transition-metal chalcogenides (TMCs) for the HER, provide the desired electrochemical reactivity for the HER. Generally, the flow electrolyzers' performance is evaluated as the overall output, but the decrease in activity of the electrolyzer is due to localized failure of the catalyst. Herein, we present a method for the spatially resolved (tens of micrometers) In Operando analysis of the catalytic activity under real operation conditions as well as the localized deposition of the catalyst in an operating model flow reactor. For these purposes, scanning electrochemical microscopy was applied for MoSx catalyst deposition and for localized tracking of the TMC activity with a resolution of 25 μm. This approach offers detailed information about the catalytic performance and should find broad application for the characterization and optimization of flow reactor catalysis under real operational conditions.
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Affiliation(s)
- Christian Iffelsberger
- Future Energy and Innovation Laboratory, Central European Institute of Technology, Brno University of Technology, Purkyňova 123, 61200 Brno, Czech Republic
| | - Stefan Wert
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, 93053 Regensburg, Germany
| | - Frank-Michael Matysik
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, 93053 Regensburg, Germany
| | - Martin Pumera
- Future Energy and Innovation Laboratory, Central European Institute of Technology, Brno University of Technology, Purkyňova 123, 61200 Brno, Czech Republic
- Department of Food Technology, Mendel University in Brno, Zemedelska 1, CZ-613 00 Brno, Czech Republic
- Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea
- Department of Medical Research, China Medical University Hospital, China Medical University, No. 91 Hsueh-Shih Road, Taichung 40402, Taiwan
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Wert S, Iken H, Schöning MJ, Matysik F. Development of a Temperature‐pulse Enhanced Electrochemical Glucose Biosensor and Characterization of its Stability via Scanning Electrochemical Microscopy. ELECTROANAL 2021. [DOI: 10.1002/elan.202100089] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Stefan Wert
- Institute of Analytical Chemistry, Chemo- and Biosensors University of Regensburg Universitätsstr. 31 93053 Regensburg Germany
| | - Heiko Iken
- Institute of Nano- and Biotechnologies (INB) FH Aachen, Campus Jülich Heinrich-Mußmann-Str. 1 52428 Jülich Germany
| | - Michael J. Schöning
- Institute of Nano- and Biotechnologies (INB) FH Aachen, Campus Jülich Heinrich-Mußmann-Str. 1 52428 Jülich Germany
| | - Frank‐Michael Matysik
- Institute of Analytical Chemistry, Chemo- and Biosensors University of Regensburg Universitätsstr. 31 93053 Regensburg Germany
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Disassembly of intermolecular hydrogen bond induced by cations on self-assembled monolayer. J Electroanal Chem (Lausanne) 2020. [DOI: 10.1016/j.jelechem.2020.114476] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Raith T, Kröninger A, Mickert MJ, Gorris HH, Matysik FM. Enhanced resolution of generator-collector studies of enzymatic structures by means of hydrodynamic scanning electrochemical microscopy. Talanta 2020; 214:120844. [PMID: 32278425 DOI: 10.1016/j.talanta.2020.120844] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2019] [Revised: 02/12/2020] [Accepted: 02/13/2020] [Indexed: 11/19/2022]
Abstract
In this report, the effects of forced convection on scanning electrochemical microscopy (SECM) studies of enzymes in the context of the generator-collector mode (G/C mode) were investigated. Forced convection was generated via an electrical high precision stirrer integrated into the electrochemical cell. Circular spots of glucose oxidase were immobilized on a gold support serving as model substrate. The diffusion layer of enzymatically generated H2O2 was characterized recording probe scan curves (PSCs) in z-direction. Furthermore, the enzyme-modified surfaces were investigated via constant-height SECM imaging in feedback mode and in G/C mode. For methodical comparison all sets of experiments were performed in quiescent solution (conventional approach) and with forced convection, respectively. In contrast to a growing diffusion layer without forced convection by applying forced convection, a constant diffusion layer of produced H2O2 was observed. Hence, via hydrodynamic SECM time-independent images within a reasonable time scale of SECM measurements in G/C mode were enabled and their resolution was enhanced.
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Affiliation(s)
- Timo Raith
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, 93053, Regensburg, Germany
| | - Anna Kröninger
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, 93053, Regensburg, Germany
| | - Matthias J Mickert
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, 93053, Regensburg, Germany
| | - Hans H Gorris
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, 93053, Regensburg, Germany
| | - Frank-Michael Matysik
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, 93053, Regensburg, Germany.
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Wert S, Fußstetter A, Iffelsberger C, Matysik FM. Scanning Electrochemical Microscopy of Electrically Heated Wire Substrates. Molecules 2020; 25:molecules25051169. [PMID: 32150947 PMCID: PMC7179101 DOI: 10.3390/molecules25051169] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2020] [Revised: 02/24/2020] [Accepted: 02/29/2020] [Indexed: 11/16/2022] Open
Abstract
We report a new configuration for enhancing the performance of scanning electrochemical microscopy (SECM) via heating of the substrate electrode. A flattened Pt microwire was employed as the substrate electrode. The substrate was heated by an alternating current (AC), resulting in an increased mass transfer between the wire surface and the bulk solution. The electrochemical response of the Pt wire during heating was investigated by means of cyclic voltammetry (CV). The open circuit potential (OCP) of the wire was recorded over time, while varied heating currents were applied to investigate the time needed for establishing steady-state conditions. Diffusion layer studies were carried out by performing probe approach curves (PACs) for various measuring modes of SECM. Finally, imaging studies of a heated substrate electrode surface, applying feedback, substrate generation/tip collection (SG/TC), and the competition mode of SECM, were performed and compared with room temperature results.
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Affiliation(s)
- Stefan Wert
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, Universitätsstr. 31, 93053 Regensburg, Germany; (S.W.); (A.F.)
| | - Alexander Fußstetter
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, Universitätsstr. 31, 93053 Regensburg, Germany; (S.W.); (A.F.)
| | - Christian Iffelsberger
- Future Energy and Innovations Laboratory, CEITEC—Central European Institute of Technology, Brno University of Technology, Purkyňova 123, 612 00 Brno, Czech Republic;
| | - Frank-Michael Matysik
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, Universitätsstr. 31, 93053 Regensburg, Germany; (S.W.); (A.F.)
- Correspondence: ; Tel.: +49-941-943-4547
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Hanekamp P, Raith T, Iffelsberger C, Zankl T, Robl W, Matysik FM. Material contrast studies of conductive thin films on semiconductor substrates using scanning electrochemical microscopy. J APPL ELECTROCHEM 2019. [DOI: 10.1007/s10800-019-01294-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Development and characterization of electrochemical flow cells for hydrodynamic scanning electrochemical microscopy. MONATSHEFTE FUR CHEMIE 2018. [DOI: 10.1007/s00706-018-2201-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Iffelsberger C, Raith T, Vatsyayan P, Vyskočil V, Matysik FM. Detection and imaging of reactive oxygen species associated with the electrochemical oxygen evolution by hydrodynamic scanning electrochemical microscopy. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.05.115] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Hanekamp P, Robl W, Matysik FM. Development and application of a multipurpose electrodeposition cell configuration for studying plating processes on wafer specimen and for characterizing surface films by scanning electrochemical microscopy. J APPL ELECTROCHEM 2017. [DOI: 10.1007/s10800-017-1124-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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